| A new interpretation of dielectric data in molecular glass formers (2006) | |||||||||||
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| THE JOURNAL CHEMICAL PHYSICS new interpretation dielectric data molecular glass formers Buchenau Ohl and Wischnewski Institut Festk rperforschung Forschungszentrum lich Postfach lich Federal Republic Germany Received November accepted January published online March Literature dielectric data glycerol propylene carbonate and ortho terphenyl show that the measured dielectric relaxation decade faster than the Debye expectation but still decade slower than the breakdown the shear modulus From comparison time scales the dielectric relaxation seems due process which relaxes not only the molecular orientation but also the entropy the short range order and the density the basis this nding propose alternative the Gemant DiMarzio Bishop extension the Debye picture American Institute Physics DOI Broadband dielectric spectroscopy has developed into the most important tool for the study glass formers able cover the whole relevant frequency range from microhertz terahertz Therefore would very desirable understand the dielectric susceptibility terms physical processes particular one would like link the peak the dielectric data the disappearance the shear modulus long times the essence the process Such link principle provided the GemantDiMarzio Bishop GDB extension Debye treatment The extension considers the molecule small sphere with hydrodynamic radius immersed the viscoelastic liquid The medium characterized frequency dependent complex shear modulus the molecule into account Onsager schem | |||||||||||
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